Scientific calculator c++:

Hi, Here is my code for a scientific calculator but i need this:

Please identify the data structures and algorithms in your program and how they are fundamental to the successful execution of the program. Must also include internal documentation (comments explaining the functioning of the source code) Basically a few paragraphs explaining the data structures in the code and their importance in the program.

COde:

#include

#include #include using namespace std; void main() { char letter; char letter1; char letter2; char letter3; char letter4; int a, b; double a1, b1; int result; double result1; cout << " ***************** SCIENTIFIC CALCULATOR ****************** "; do { cout << "\t 1 : Arithmetic Operations "; cout << "\t 2 : Trigonometric Functions "; cout << "\t 3 : Logarithmic Functions "; cout << "\t 4 : Power Functions "; cout << "\t 5 : Exit... "; cin >> letter; switch (letter) { case '1':

{ cout << " "; cout << "\t1 : Addition "; cout << "\t2 : Subtraction "; cout << "\t3 : Multipilication "; cout << "\t4 : Division "; cin >> letter1; switch (letter1) { case '1': { cout << " Enter first number..."; cin >> a; cout << "Enter an other number..."; cin >> b; result = a + b; cout << " Result = " << result << endl; break; } case '2': { cout << " Enter first number..."; cin >> a; cout << "Enter an other number..."; cin >> b; result = a - b; cout << " Result = " << result << endl; break; }

case '3': { cout << " Enter first number..."; cin >> a; cout << "Enter an other number..."; cin >> b; result = a * b; cout << " Result = " << result << endl; break; }

case '4': { cout << " Enter first number..."; cin >> a; cout << "Enter an other number..."; cin >> b; if (a != 0) { result = a / b; cout << " Result = " << result << endl;

} break; } } // end of inner switch break; } // end of case 1 arithmatic operation

case '2': { cout << " "; cout << "\t1 : Sin function "; cout << "\t2 : Cos function "; cout << "\t3 : Tan function "; cin >> letter2; switch (letter2) { case '1': { cout << " Enter a number..."; cin >> a1; result1 = (sin(a1)); cout << " Result = " << result1 << endl; break; } case '2': { cout << " Enter a number..."; cin >> a1; result1 = (cos(a1)); cout << " Result = " << result1 << endl; break; } case '3': { cout << " Enter a number..."; cin >> a1; result1 = (tan(a1)); cout << " Result = " << result1 << endl; break; } } // inner switch break; } // inner case 2 trignomatic case '3': { cout << " "; cout << "\t1 : Natural log "; cout << "\t2 : log with base 10 "; cin >> letter3; switch (letter3) { case '1': { cout << " Enter a number..."; cin >> a1; result1 = log(a1); cout << " Result = " << result1 << endl; break; } case '2': { cout << " Enter a number..."; cin >> a1; result1 = log10(a1); cout << " Result = " << result1 << endl; break; } } // end of switch break; } // end of case 3 logrithmic case '4': { cout << "1) Press 1 for Power "; cout << "2) Press 2 for Square root "; cout << "Enter your choice...."; cin >> letter4; switch (letter4) { case '1': { cout << " Enter a number..."; cin >> a1; cout << "Enter power..."; cin >> b1; result1 = pow(a1, b1); cout << " Result = " << result1 << endl; break; } case '2': { cout << " Enter a number..."; cin >> a; result1 = sqrt(a); cout << " Result = " << result1 << endl; break; }

} // end of switch break; } // end of case power function

} // outer switch } while (letter != '5'); }